题目内容

Our bad living habits will destroy the earth. Only by changing ________we live can we save the earth.

A. that
B. what
C. how
D. where

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Thinking that you know _________ in fact you don’t is a serious mistake.

A. what
B. that
C. when
D. however

The town _ I visited last summer is the most beautiful town_ I know.

A. which…which
B. which…that
C. where…which
D. which…where

The town _ I lived in my childhood is the most beautiful town _ I know

A. which…which
B. which…that
C. where…which
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He is one of the boys who ______ in the exam

A. have failed
B. has failed
C. fails
D. are failed